Tool for dressing emery-wheels.



O. H. STEPHAN. TOOL FOR DRESSING EMERY WHEELS.

APPLICATION FILED PEI-13.8, 1909.

Patented Mar. 29, 1910.

% f I M Svwemroz attorney Witwzooeo LES H. STEPHAN, OF DAYTON, OHIO.

T0011 FOR DRESSING EMERY-WHEELS.

Specification of Letters Patent.

, Application filed February 8, 1909.

Serial No. 476,617.

To all whom it my Be it known that I, CHARLES H. SrnrnAN, a citizen ofthe United States, residing at Dayton, in the county of Montgomery andState of Ohio, have invented certain new and useful Improvementsin Toolsfor Dressin Emery-Wheels; and I do declare the 0 owing to be a full,clear, and exact description'of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and tothefigures of reference marked thereon, which form a part of thisspecification.

My invention relates to a tool for grinding emery wheels.

The invention consists in the method of making the dressing tool and bymeans of which method a fimshed article is produced having the featureshereinafter described and claimed.

The object of the invention is to produce the abrasive material in thehardest possible form or in such a vitrified condition as to meet therequirements. In other words, the abrasive substance is ca able ofdressing an emery wheel in the bar est possible form in which it can beproduced and the life of such abrasive substance is greatly lengthenedby bein thus roduced -in the most intense vit ed con ition.

It is essential that theabrasive substance be incased in a metalliccasing after it has been formed and baked or vitrified in order. thatthe stick so formed shallbe preserved and prevented from breakingwhilein actual use. Heretofore, it has been the common method to tampthe abrasive substance into a metallic tube and to then subject the tubewith the abrasive substance therein to the baking process; this,however, has been found undeslrable for it is impossible to subject thematerial to a sufiicient heat without at the same time endangerin thetube itself to melting. It is also deslrable that when the stick ofabrasive substance is incased 1n the "tube, that'the two shall be sounited or brou ht into such rigid contact as to practicalfy constitutethem one'integral member for all practical PIHFOSGS. g I A furtherobject o my invention is to pro- I vide a tool for dressing emery wheelswhich,

vowing to its formation, may be ppplied at one stage of its existence tosma wheels, and at a later stage of its existenceto be applied to thelarger emery wheels. In other words, heretofore it has been the customtoprovide these tools in different sizes to meet the requirements aboveindicated. With the present tool, such is not required. I

Preceding a more detailed description of the invention, reference ismade to the ac-' companying drawings, of which- Figure 1, is alongitudinal elevation of my lmproved emery wheel dressing tool, aportion' of the metallic casing being broken away to show the vitrifiedabrasive substance. Fig. 2, is a longitudinal sectional view of themetallic tube showing the same before the union with the stick ofabrasive substance. Fig. 8, is a longitudinal eleva- Patented Mar.29,1910.

tion of the stick of vitrified abrasive material before its insertion inthe metallic holder. Figs. 4 and 5, are cross sections on the lines a aand b b of Fig.1."

In a detail description ,of the invention, slmilar reference charactersindicate corresponding parts.

The abrasive substance is first formed and is baked to the propervitrified condition before it is incased. The form of the material isthat of a stick 2 which is tapered throughout its length from one end tothe other; the tapered form of the stick of vitrified abrasive substanceis essential aswill resently appear. The holder for this vitri ed stickof abrasive substance essen; tially conforms to the same tapered shapeand'consists of a metal tube 1 which is formed of sheet metal,preferably block tin or such other metal having the requisite strengthto withstand the force applied tothe stick of abrasive-substance whenthe latter is inserted in said tapered holder. The, stick of abrasivesubstance is formed sub'- stantially as shown in Fig. 3 andlis in thatcondition subjected to the requisite amount of heat to produce onehomogeneous stick of material. The stick so form'edis placed in thetapered holder and theinecessary pressure is exerted longitudinallymn'the larger end of the stick to drivefthe same into the tube in awedge-like manner-until the tube andthe stick are most -fir mly andrigidly united. After the stick of abrasive material I is so firmlyand-rigidly placed within'the tapered holderythewooden handle'3-isinserted in thelargerend of the holder and.

umtedthereto. The smaller-end of the stick of abrasive substanceprojects out of the smaller end of the holder, and as the said end Wearsaway by contact with the emery wheel, the end of the metallic holder islikewise Worn away by the grinding operation or it may be removed bycutting the same to expose the end of the abrasive material.

It will be understood that the tool is serviceable for practicalpurposes as long as there is sufiicient length to it. It will thereforebe seen as the working end of said tool wears away, the abrasive stickbecomes of greater diameter and is thus suitable for iipplication uponlarger emery wheels. As

on initial condition, the working end thereof is comparatively small ascompared with the larger portions of the body of the tool, therefore thetool is adapted for dressing the smaller emery wheels until its lengthis reduced to the larger diameters when it becoms suitable for dressingthe larger wheels.

This obviates the necessity of constructing different sizes of'tools',as it will be apparent from the foregoing description.

It will be understood that the abrasive material consists of any of thewell-known materials, and a suitable binding by which the grindingmaterial is solidified.

as the tool remains substantially in its esaaes Having described myinvention, I claim:

1 1. An improved article of manufacture 'lcomprising a dressingtoolconsisting of a ing material is compressed after fusing, the fusingpoint of said tapered stick of abrading material being ata degree ofheat which exceeds the melting point of the metallic casing.

comprising a dressing tool consisting of a stick of fused abradingmaterial of tapered form, and a sheet metal casing of similar forminclosing said tapered stick of abrading. material and wlthin whichtapered metal casing said stick of fused abrading material is compressedafter fusing, and the larger end of said metallic casing having a handleportion fixed thereto.

In testimony whereof li aflix my signature, in presence of twowitnesses.

CHARLES H. STEPHAN;

i Witnesses:

MATTHEW SmBLEr CAROLYN M. THIEUBALD.

2. An improved article of manufacture I

